The Mole The?Avogadro constant?(NA?or?L) is the number of particles equivalent to the relative?atomic?mass?or?molecular mass?of a substance in grams The Avogadro constant applies to atoms, molecule...
State Changes Changes of state are?physical changes?that are reversible These changes do not change the chemical properties or chemical makeup of the substances involved Vaporization?includes?evapo...
Balancing Equations A?symbol?equation is a shorthand way of describing a chemical reaction using?chemical symbols?to show the number and type of each atom in the reactants and products A?word?equat...
Elements & Compounds Elements are substances made from one kind of atom Compounds are made from two or more elements?chemically combined Elements take part in chemical reactions in which new su...
Male & Female Diagrams You should be able to?annotate diagrams?of the female and male?reproductive systems?to show the names of the different?structures You should also be able to recall the?fu...
Oestrogen & Progesterone During early development an embryo develops?embryonic?gonads?that will either become?ovaries?in females or?testes?in males The factor that determines whether the embryo...
SRY Gene In?sexual reproduction?in?humans, a sperm from a male fuses with, or fertilises, an egg from a female to form a?zygote, which then develops into an?embryo To begin with the embryo develops...
William Harvey & Sexual Reproduction in Deer William Harvey (1578 - 1657) was an English?physician?who contributed greatly to our understanding of?anatomy?and?physiology He is mainly remembered...
Leptin Leptin?is a?hormone?that is secreted by fat storage cells known as?adipose cells The concentration of leptin in the blood is controlled by the?amount of adipose tissue?in the body As we eat ...
